See-through clothes: Fashion-forward or tacky?

Sheer fabric definitely makes an outfit interesting, but when peek-a-boo reveals bras, undies and more, is it sexy, slutty or both? Not that there’s anything bad with either, just a question of what you like.

Photo: Imeh Akpanudosen / Getty Images

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Julianne Hough shows off her assets in a strategically sheer dress at a "Us Weekly Hot Hollywood Style" event on April 18 in West Hollywood, California.

Julianne Hough shows off her assets in a strategically sheer dress at a "Us Weekly Hot Hollywood Style" event on April 18 in West Hollywood, California.

Photo: Imeh Akpanudosen / Getty Images

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Yup, that's a black bra under white lace on Sarah Jessica Parker at the a Louis Vuitton show Fall/Winter on March 7 in Paris.

Yup, that's a black bra under white lace on Sarah Jessica Parker at the a Louis Vuitton show Fall/Winter on March 7 in Paris.

Photo: Pascal Le Segretain / Getty Images

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And that's no bra on Olivia Wilde at a 'Cowboys and Aliens' premiere last August in London.

And that's no bra on Olivia Wilde at a 'Cowboys and Aliens' premiere last August in London.

Photo: Ian Gavan / Getty Images

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Hayden Panettiere tries to cover up - or not? - at a Golden Globe Awards party last year.

Hayden Panettiere tries to cover up - or not? - at a Golden Globe Awards party last year.

Photo: Kevork Djansezian / Getty Images

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Maria Sharapova layers a tube top and sheer top at a Crown's Tennis Players' Party in Melbourne, Australia.

Maria Sharapova layers a tube top and sheer top at a Crown's Tennis Players' Party in Melbourne, Australia.

Photo: Graham Denholm / Getty Images

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Blake Lively shows off her legs in a long dress at the "Green Lantern" premiere.

Blake Lively shows off her legs in a long dress at the "Green Lantern" premiere.

Photo: Jason Merritt / Getty Images

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Blake Lively does sheer in a short dress.

Blake Lively does sheer in a short dress.

Photo: Stephen Lovekin / Getty Images

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If you're going to make a statement, this Jean Paul Gaultier number would be the outfit. (Fergie at the Grammy awards in February).

If you're going to make a statement, this Jean Paul Gaultier number would be the outfit. (Fergie at the Grammy awards in February).

Photo: Jason Merritt / Getty Images

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Here's the same outfit on the runaway at Paris Fashion Week in January.

Here's the same outfit on the runaway at Paris Fashion Week in January.

Photo: Pascal Le Segretain / Getty Images

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More lace, sheer and a peek at underthings from Brooklyn Decker at the 'Battleship' premiere in South Korea on April 5.

More lace, sheer and a peek at underthings from Brooklyn Decker at the 'Battleship' premiere in South Korea on April 5.

Photo: Chung Sung-Jun / Getty Images

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Madonna, a long abider of see-through outfits, is pictured on April 12 for the launch of her new fragrance, "Truth Or Dare."

Madonna, a long abider of see-through outfits, is pictured on April 12 for the launch of her new fragrance, "Truth Or Dare."

Photo: Stephen Lovekin / Getty Images

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This runway look comes from the Dior Haute-Couture show in Paris in January.

This runway look comes from the Dior Haute-Couture show in Paris in January.

Photo: Pascal Le Segretain / Getty Images

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Always fashion-forward, Olivia Wilde uses sheer stripes to give a little glimpse on April 22 at the "DeadFall" premiere in New York.

Always fashion-forward, Olivia Wilde uses sheer stripes to give a little glimpse on April 22 at the "DeadFall" premiere in New York.